The most irons bars bent in a minute is 24 and was achieved by Alexander Muromskiy (Russia) at Global city shopping centre, in Moscow, Russia, on 30 April 2011.
Alexander Muromskiy had organised a day of activities outside the shopping centre and part of the days events was to beat his own Guinness World Records title for the most telephone directories torn behind the back in three minutes. I timed the attempt whilst two independent witnesses were present on stage with me.